[ENG-17987][eas-cli] delete branch in background

[quinlanj]

Why

Add support for deleting EAS branches and their updates in the background. Previously, branch deletion was done synchronously, which could lead to timeouts or failures when deleting branches with many updates. This change implements a background job approach for branch deletion to improve reliability.

How

• Added a new GraphQL mutation scheduleUpdateBranchDeletion that creates a background job for branch deletion
• Created a new utility function scheduleBranchDeletionAsync in a new file branch/delete.ts
• Updated the branch delete command to use the background job approach instead of the synchronous deletion
• Added polling for the background job completion using pollForBackgroundJobReceiptAsync
• Updated GraphQL schema with new types for branch deletion and workflow insights

Test Plan

• Create a branch with EXPO_DEBUG=1 eas-dev branch:create
• delete branch with: EXPO_DEBUG=1 eas-dev branch:delete, ensure successful receipt
• ensure successful deletion: eas-dev branch:list, make sure branch we just deleted is absent

[quinlanj]

• [ENG-17987][eas-cli] delete branch in background #3258 👈 (View in Graphite)
• main

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[linear]

ENG-17987 Update branch deleteUpdateBranch needs to be background job

[github-actions]

Size Change: -1.37 kB (0%)

Total Size: 54.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	54.9 MB	-1.37 kB (0%)

_{compressed-size-action}

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder

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[codecov]

Codecov Report

❌ Patch coverage is 58.82353% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.91%. Comparing base (dead119) to head (14ac9c1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/branch/delete.ts	33.34%	4 Missing ⚠️
packages/eas-cli/src/branch/delete.ts	57.15%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3258      +/-   ##
==========================================
+ Coverage   51.89%   51.91%   +0.02%     
==========================================
  Files         631      632       +1     
  Lines       25860    25872      +12     
  Branches     5435     5436       +1     
==========================================
+ Hits        13418    13428      +10     
- Misses      11323    11325       +2     
  Partials     1119     1119              

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[github-actions]

✅ Thank you for adding the changelog entry!